Add configure test to verify SSE2 code compiles.
Make sure that emmintrin.h can be #include'd without causing a compilation error, rather than blindly defining HAVE_SSE2 based on architecture. Attempts to force SSE2 compilation on a 32-bit Ubuntu 13.10 system running as a VMware guest resulted in a no-win choice without any obvious explanation besides toolchain misconfiguration/bug: - Suffer compilation failure due to __MMX__, __SSE__, and __SSE2__ not being defined, even if -mmmx, -msse, and -msse2 are manually specified (note that they appear to be enabled by default). - Manually define __MMX__, __SSE__, and __SSE2__, and suffer compiler warnings that they are already automatically defined. This results in successful compilation and execution, but the noise is intolerable.
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configure.ac
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configure.ac
@ -198,21 +198,21 @@ CPU_SPINWAIT=""
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case "${host_cpu}" in
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case "${host_cpu}" in
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i[[345]]86)
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i[[345]]86)
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;;
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;;
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i686)
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i686|x86_64)
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JE_COMPILABLE([__asm__], [], [[__asm__ volatile("pause"); return 0;]],
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JE_COMPILABLE([pause instruction], [],
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[je_cv_asm])
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[[__asm__ volatile("pause"); return 0;]],
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if test "x${je_cv_asm}" = "xyes" ; then
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[je_cv_pause])
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if test "x${je_cv_pause}" = "xyes" ; then
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CPU_SPINWAIT='__asm__ volatile("pause")'
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CPU_SPINWAIT='__asm__ volatile("pause")'
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fi
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fi
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dnl emmintrin.h fails to compile unless MMX, SSE, and SSE2 are
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dnl supported.
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JE_COMPILABLE([SSE2 intrinsics], [
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#include <emmintrin.h>
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], [], [je_cv_sse2])
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if test "x${je_cv_sse2}" = "xyes" ; then
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AC_DEFINE_UNQUOTED([HAVE_SSE2], [ ])
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AC_DEFINE_UNQUOTED([HAVE_SSE2], [ ])
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;;
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x86_64)
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JE_COMPILABLE([__asm__ syntax], [],
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[[__asm__ volatile("pause"); return 0;]], [je_cv_asm])
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if test "x${je_cv_asm}" = "xyes" ; then
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CPU_SPINWAIT='__asm__ volatile("pause")'
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fi
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fi
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AC_DEFINE_UNQUOTED([HAVE_SSE2], [ ])
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;;
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;;
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powerpc)
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powerpc)
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AC_DEFINE_UNQUOTED([HAVE_ALTIVEC], [ ])
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AC_DEFINE_UNQUOTED([HAVE_ALTIVEC], [ ])
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